<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        /* vw和vh是相对视口宽高计算，可以直接实现移动端适配效果 */
        /* .box{
            width: 50vw;
            height: 30vw;
            background: pink;
        } */
        .box{
            width: 50vh;
            height: 30vh;
            background: pink;
        }
    </style>
</head>
<body>
    <div class="box">

    </div>
</body>
</html>